Checking the schedule

 Today, I should have had a class of history. I prepared some equipments and red  a book of history, to go to the class. I got on the train and walked to UNP. 

 However, during the way of UNP, I realized that today's history class was not done. I was disappointed. I wasted much time. My preparation was not necessary.

 I thought that I have to check schedule of classes carefully.

                                 I realized there.